# C > Games and Graphics Code Examples

## Number Magic in C.

``` Number Magic in C. #include<stdio.h> #include<conio.h> int generate(void); int fun(int); void main() { int i,a,r; clrscr(); gotoxy(30,12); printf("Welcome You! IN THE JARGON OF A NUMBER.."); printf(" Press any key to continue...."); getch(); clrscr(); gotoxy(15,8); printf("Just think a number between 1 to 63 in your mind"); printf(" Think on one "); printf("Do not enter that number"); printf(" I will find that number on your mind...."); printf(" Press any key to continue..."); getch(); clrscr(); gotoxy(20,7); printf("By Just answering few questions...."); printf(" If your number is present in the numbers"); printf(" shown on your screen, Then press P and if not present"); printf(" then press N "); printf(" But please be honest while entering the answer..."); printf(" Press any key to continue..."); getch(); clrscr(); r=generate(); if(r==0) { gotoxy(20,11); printf("You didn't think of any number between 1 to 63"); printf(" So try again..."); } else { gotoxy(30,11); printf("Your number is %d",r); printf(" Surprised! But friends it is not a magic,"); printf(" it just involves some mathematical computation...."); printf(" so guys just try to find out the method. "); printf(" Thank You! "); getch(); } int generate() { int a,i,j,f,num[6],n,r=0; char ch[6]; for(j=0;j<=5;j++) { gotoxy(1,7); f=fun(j); for(i=1;i<=63;i++) { //f=fun(j); //printf("%d",f); a=i & f; if(a==f) //gotoxy(5,10); printf(" %d",i); } printf(" Let me remind you if the number is present then"); printf(" press P otherwise press N"); printf(" Enter your answer: "); ch[j]=getche(); printf(" Press any key to continue...."); //clrscr(); if(ch[j]=='p' || ch[j]=='P') { num[j]=1; n=fun(j); r=r+n; } else num[j]=0; getch(); clrscr(); } /* for(j=5;j>=0;j--) { printf("%d",num[j]); // if(ch[j]=='p' || ch[j]=='P') // num[j]=1; // else // num[j]=0; } */ // printf(" %d",r); return r; } int fun(int j) { if(j==0) return 1; else return 2*fun(j-1); } ```